Christmas

should i get mg boyfriend's parents something for Christmas? this would be our first Christmas together what should i do?should i get his little sisters (5) and his brothers (2) something?  
will update if they're questions . 
update 
he has 5 sisters 20,9,9,7,6
he has 2 brothers 19,16
update #2 
i have been with him for almost 2 yrs & i have met his family more than twice 
update #3 
his dad says im his favourite daughter-in-law & that i will spend a lot of time with my mother-in-law (his mom) if my boyfriend join the navy