ANSWER:

You must wear the full hijab (abaya & niqab if you wear the niqab outside) in front of them.

You must not free mix, nor chitchat or socualize with your male cousins or any other non mahram men!

The gathering should be segregated.

QUESTION: Guests and cousins will come on Eid so should I wear abaya or can I wear long loose kurta below knees and loose salwar at home with hijab which is long