Thank yous

Usually they would have brought you one gift so the thank you card would go to your main contact person with a reference to both of them. However, if they each got you a gift then you should send them each a separate card.

I'd give them one if they gave it to you separately

For a date I would only give one thank you. If it’s a group of friends or family who put in for a large gift together, I would send them separately.

I would mail one thank you card to her addressed to both of them and she can share it with him (I'm definitely not going to bother sending separate thank you notes to plus ones).

View Quoted Comment Thank you I found it a bit strange

View Quoted Comment Thank you! I thought it was strange they don’t live together

As PPs said, if they gave you a combined gift send one to your friend and address it to both of them. Unless he gifted you personally, no need to send a separate thank you. Was he a plus one for your friend, or did you add him on the invitation? Just curious, it’s even more bizarre for her to send his address if she just brought him as a plus one.

View Quoted Comment He was her plus one she signed the card from both of them. I will just send her the thank you and add him to the note

I would just send the thank you to the main contact.

Sometimes, though plus ones do not know you well, they still contribute a share of money toward a gift from the couple ( I used to pay about 1/3, FI 2/3 for his friends, reverse for mine, when we were dating.). So, though a smaller share, it amounts to more than a hostess gift, and both people should receive cards, addressed to them separately, at their home addresses. I would guess that knowing her date contributed, she automatically supplied the name and address.