AITAH for asking to leave early?

This thanksgiving my husband (30M), my mom, me (29 F, currently 7 months pregnant) and my son 2.5 years, drove about 7.5 hours to see my stepdad for thanksgiving. My sister (21F) also flew down to visit. We hadn’t decided when we were going to leave (Saturday morning or Sunday afternoon) since I wanted to see first how the trip was going. My family isn’t the best to be around sometimes. Friday afternoon my mom asks when we’re leaving because my sister now wants to leave early, so we agree to leave Saturday. My mom called me around nap time so I wasn’t able to get all the details or talk to my husband but I knew he would be okay with taking my sister to the airport. Later that night we saw them for dinner so we asked for them to be ready to leave by 8-9 am so we can get home before dark and put my son to bed at a reasonable time. That’s when things went south… no one agreed with our plan. My dad said that he didn’t want my sister to be at the airport alone for 4 hours (her flight leaves at 5 and is 3 hours away from where we are), my sister said she didn’t want to wake up that early, and my mom just went along with whatever my sister said. I tried to explain to them that since dropping her off is OUT of our way home by 2 hours we’d like to leave early since it’s already going to take us extra time to get home since I constantly have to pee and my toddler needs diaper changes and we have to get lunch somewhere. It’s also supposed to rain all day so that’ll add even more time since we’ll be driving slower. On our way here it took us almost two extra hours with all the stops we made. Total to get to my dad’s it took us 7.5 hours. This caused my dad to yell at my husband saying that he was hoping we’d do him the favor of taking my sister instead of making him drive and my sister also getting upset saying I was being rude/an AH for making my dad drive her, since they all refuse to wake up early to eat breakfast together so we can leave by 8-9 am. Am I the asshole for just asking to leave early? I get that being at the airport for 3-4 hours before your flight isn’t ideal but we’re not saying we don’t want to drive her, we really don’t mind, but we’d just like to leave early.