Is this favoritism?

My husband and I are due in the next few weeks with our second girl, our oldest is 5.

My sister is due with her first (she had a child one or two years before we had our first, but she gave him up for adoption).

My parents didn’t show much enthusiasm or excitement when we had our first because they didn’t want to hurt my older sisters feelings. She gave up her son because she wasn’t sure who the father was and was still in her “young and dumb drinking phase” as she puts it. So they didn’t throw me a shower, and have never gotten our daughter a gift - and never have been around on her birthdays, holidays. Conveniently every year around our daughters birthday my older sister has a breakdown and needs my parents to comfort her about her son.

My sister cut me off once I was pregnant the first time and was angry at me and my husband for “bringing back memories” for her. Our parents defended her because of how traumatic the adoption was for her. She has never met our 5 year old - avoids our parents house if we’re visiting, blocked me on social media, doesn’t even know our daughters middle name or birthday.

My sister is only a month or two behind me pregnancy wise according to our Mom, and I can’t help but feel some type of way. Our parents (mom mainly) is going all out for a baby shower for her, buying her the crib and nursery furniture, setting up plans to attend her labor/birth. Taking leave off work to stay with her the first few weeks. Buying her baby clothes, baby books; etc.

Meanwhile they are still “happy for us” but say because it’s our second they shouldn’t have to do anything. Which okay - but they also refused to be happy or help the first time because of my sister and now they are refusing again so they can focus on her.

Is this favoritism? I am getting royally pissed off and it seems my feelings are always pushed aside. I am not sure if we will have another child so the thought of both of my pregnancies being ignored because of my sister is rubbing me the wrong way.