s/o If you avoid addressing your ILs by name

[IIOY]

Mr. LastName.

What I call my ILs caused a big blow-up in the beginning of our marriage. I refuse to call them Mom and Dad (even my step-father, who essentially raised me, doesn't get called Dad) and I refuse to call them Mr. and Mrs. LastName because they are my ILs, not some folks I just met. As a result, I never address my FIL (MIL is now deceased) by any name or title.

[5thofjuly]

They sign with their first names, like "June and Ward"

[Deleted]

My birthday card is signed with their first names.

DH's card is signed mom and daddy. I find this bizarre.

[carfar]

They usually sign

first names,
The outlaws.

[max88]

For cards to both of us, like holiday cards, they sign Mom and Dad. I don't think I've ever noticed for my birthday cards, I think it's Mom and Dad Lastname.

[bcv513]

Neither one of us gets cards or presents from them.

[mollz007]

They usually sign it by their first names. They have no issues with me calling them by their first name, but I just don't feel comfortable doing it.