Breakdown of Han är mycket lik sin bror.
vara
to be
mycket
much / very
brodern
the brother
sin
his/her/its/their own (en-word)
Questions & Answers about Han är mycket lik sin bror.
Why does the sentence use är lik instead of ser ut som for "looks like"?
Ser ut som is the general phrase for "looks like", used for situations like looking like a ghost or looking like it will rain. However, att vara lik någon (to be like someone) is the most natural way in Swedish to describe physical resemblance between people, especially family members.
Why do we use sin instead of hans for "his"?
Sin is a reflexive possessive pronoun that always points back to the subject of the same clause (Han). If you wrote hans bror here, it would mean he looks like a completely different man's brother. Using sin clarifies that it is his own brother.
Since lik is an adjective, does it change based on the subject?
Yes, it follows standard adjective agreement rules. Because Han is singular and takes an en-word form, we use lik. If the sentence were plural, like "They are a lot like their brother", the adjective would get an -a ending: De är mycket lika sin bror.
Could I use väldigt instead of mycket?
Absolutely. Väldigt lik (very similar) is extremely common in spoken Swedish and means the exact same thing as mycket lik.