You probably need to conjugate 'esquiar' to ustedes form but that depends on the form you guys are in like: Present or Past Pogressive, Preterite...etc.
Yes, this is grammatically correct.
Yes mis hermanos están feliz (my brothers are happy and btw if not the answer I need more info)
Answer:
345678999999999999999998765432
Explanation:rtghjkjhgfdsaqswtfry
4567
