Questions & Answers about wǎnshang wǒ hé māma zuò zài shāfa shàng kàn diànshì.
In Mandarin, time words often come before the main action.
So the basic order is often:
Here:
晚上 + 我 + 和妈妈 + 坐在沙发上看电视
That is very natural in Chinese. It sets the time first, like In the evening, I and my mom sit on the sofa and watch TV.
You could also say the time later in some contexts, but putting it near the beginning is one of the most common patterns.
Mandarin often uses noun phrases joined by 和 instead of replacing them with we.
So 我和妈妈 simply means my mom and I.
Chinese does have 我们, meaning we, but that would only work if the listener already knows who is included. If you specifically want to say my mom and I, then 我和妈妈 is clearer.
Also, in more polite usage, Chinese often puts the other person before oneself, so 妈妈和我 is often considered more polite than 我和妈妈. Both are understandable, but many teachers prefer 妈妈和我 in formal examples.