Xmas Card Etiquette to recently separated couple

[WinlessChunder]

Some married friends of ours have recently (in the last couple of weeks) separated. I know that she has remained in the family home with their DS and that the husband has moved out but I don't know where to. We knew them both before they married so there is no 'sides' and we are equal friends with both. We want to send them both a Xmas card. Do you think we should:

a. Send one with all 3 names on to the family home
b. Send one card with her and DS's name on to the family home and another to him to the same address asking her to pass it on
c. Ask her for his temporary address so we can send one to him

WWYD?

b.
With DCs names on both cards

Send one to get and ds an ask for his address

I would send a card to each adult with the children's names on both cards. I would ask her if she has an address or if she would pass it on for me.