I haven't seen this one before and I want to verify whether I'm overreacting here.. or whether this is "acceptable."

My stepdaughter is 32, married, with one child. I have been married to her dad for 18 years. She and I have a civil relationship that we both work on... no warm and fuzzies. We're both aware of underlying tensions and try to work around them or live with them. For her father's sake.