<human>: Condense the text into a few key points

I am getting married in about 2 months. Is it normal for my dad and his longtime girlfriend (LTG) to want such a relationship with my in-laws? My in-laws are a lot more forthcoming and nice than my dad and LTG, and dad and LTG are always telling my in-laws things that they don't tell me. I had to find out that LTG's dog died from my in-laws! It is actually so odd.

My in-laws have said things before to my fiancé along the lines of "You are marrying Oshkosh! I'm not marrying [Oshkosh's] dad!" My dad also asked fiance's dad to go to San Diego and "surprise" fiancé and I there when we were going to be there for a weekend. Fiance's dad declined because he thought it was presumptuous to just show up on someone else's vacation (and I agree).

I'm just trying to get some perspective on whether it's normal for my parents to talk to my in-laws so much. My impression from my own family is that it's not. And to be honest, it feels like a power grab from them almost, like they want to be able to talk to and control my life through them.
<bot>: – Do my dad and LTG have boundary issues because they talk to my in-laws so much and tell them things that they don't tell me?