sohu no ie de ha, hiru ni udon wo tabete, yoru ni sasimi wo taberukoto ga ooi.

で marks the place where an action happens, so 祖父の家で means at my grandfather's house.

When は is added, では gives the location a topic or contrast nuance:

• 祖父の家で = at my grandfather's house
• 祖父の家では = as for at my grandfather's house / at my grandfather's house, ...

So では suggests something like when we're at my grandfather's house, this is often what happens, and it can mildly imply that things may be different elsewhere.

It literally means my grandfather's house.

Breakdown:

• 祖父 = grandfather
• の = shows possession or connection
• 家 = house, home

So 祖父の家 is grandfather's house or my grandfather's home.

In Japanese, 祖父 usually refers to my own grandfather or someone in my in-group when speaking neutrally.

Here, に marks the time when something happens:

• 昼に = at noon / in the daytime / for lunch time
• 夜に = at night / in the evening / for dinner time

Japanese time expressions sometimes take に and sometimes do not. With words like 今日 or 明日, に is usually not used. But with words like 昼 and 夜, using に is very natural in a sentence like this.

So:

• 昼にうどんを食べる = eat udon at lunchtime
• 夜に刺身を食べる = eat sashimi at night / for dinner

In this sentence, it is closer to at lunchtime or for lunch than to the exact clock time 12:00 noon.

So 昼にうどんを食べて naturally suggests:

• eat udon for lunch
• or eat udon during the day / at lunchtime

Likewise, 夜に刺身を食べる suggests eat sashimi for dinner / at night.

The exact English wording depends on the translation style, but the Japanese is not focusing on a precise time.

食べて is the て-form of 食べる. Here it links two actions together:

• 昼にうどんを食べて、
• 夜に刺身を食べる

So it means something like:

• eat udon at lunch, and eat sashimi at night

The て-form often works like and, especially when listing actions in sequence.

Not necessarily. The て-form can show sequence, but it does not always mean right after.

In this sentence, there is clearly a big time gap between 昼 and 夜, so the meaning is simply that both things happen in the same general pattern:

• at lunch, udon is eaten
• at night, sashimi is eaten

So 食べて is just connecting the two actions, not saying they happen one after another with no break.

This is a very common grammar pattern:

• verb dictionary form + ことが多い

It means:

• often do ...
• it is often the case that ...

So:

• 食べることが多い = often eat / it often happens that [someone] eats

In this sentence, the pattern applies to the whole linked action:

• 昼にうどんを食べて、夜に刺身を食べることが多い
• It is often the case that [we/they] eat udon for lunch and sashimi for dinner.

Both can express frequency, but they are a little different.

• よく食べる = eat often
• 食べることが多い = it often happens that [someone] eats / there are many occasions when [someone] eats

ことが多い feels slightly more descriptive and pattern-based. It often sounds like the speaker is talking about what usually tends to happen.

In this sentence, ことが多い works especially well because the speaker is talking about a recurring combination of actions, not just one food item by itself.

In this sentence, it most naturally applies to the whole sequence:

• 昼にうどんを食べて、夜に刺身を食べる
• ...ことが多い

So the meaning is:

• It is often the case that we eat udon for lunch and sashimi for dinner.

It is not just saying we often eat sashimi at night by itself. The structure suggests that the lunch-and-dinner pattern as a whole is frequent.

Japanese often leaves the subject unstated when it is understood from context.

So this sentence does not explicitly say I, we, or they. Depending on the situation, it could mean:

• I often eat...
• we often eat...
• people at my grandfather's house often eat...

In many everyday contexts, a learner will understand it as something like:

• At my grandfather's house, we often eat udon for lunch and sashimi for dinner.

The exact subject comes from context, not from the grammar of this sentence alone.

The comma helps separate the topic phrase from the rest of the sentence:

• 祖父の家では、 = As for at my grandfather's house, ...

It makes the sentence easier to read and reflects a natural pause. Japanese punctuation is somewhat flexible, but in a sentence like this, the comma is very normal.

Yes, 刺身を食べる is completely natural.

Even if the object is obviously food, Japanese still normally uses を with 食べる:

• うどんを食べる = eat udon
• 刺身を食べる = eat sashimi

So there is nothing unusual here.

Yes, depending on context, usually can sound natural in English.

• ことが多い literally leans more toward often or it is often the case that
• but in smooth English, usually may fit well if the speaker is describing a normal pattern

For example:

• At my grandfather's house, we often eat udon for lunch and sashimi for dinner.
• At my grandfather's house, we usually have udon for lunch and sashimi for dinner.

Both are reasonable, though often is closer to the grammar itself.

Yes. 家 can mean either house or home, depending on context.

So 祖父の家 could be translated as:

• my grandfather's house
• my grandfather's home
• sometimes even my grandparents' place in natural English

House is the more literal translation, but home may sound more natural in some contexts.