Okay, forget about responding to the uncle but you really should ask your parents if they are upset with you. To be honest, you do sound a bit entitled. You don’t need to thank them every 5 minutes but you also don’t need to be rude to them either. Your parents invited you there to spend time with you. Get up earlier and have a cup of coffee before they get up so you can converse with them for 10 minutes before you go to work. As a parent of college age kids who are almost fully out of the house, I can see why your parents are annoyed.

I also agree with the pp that your parents likely get no alone time in the house if you and your dh are working all day. Do your parents have to be quiet so you guys can work? Do they have to listen to your conference calls? Even if you are in separate rooms, they may hear you on the phone.

Maybe take them out for a thank you dinner or buy them a nice dessert to show you appreciate their hospitality.

OP we spend a ton of time in the summer at my dad’s. He likes the company, he encourages the visits, but in reality, he needs breaks from having people in his home and space to regroup every so often. No we come for a couple of weeks at a time, going home in between. It works out much better. Even though the want you to come and invite you for 8 weeks, think about what it would be like to have someone in your space for that long - even someone you wanted to spend time with. They may not even consciously realize why they’re bothered. Just something to consider.

Don't respond to the uncle about the speeches. If he then asks in person just say you'll think about it and then do nothing.

Don't take the bait, don't even continue to think about it.

BS there is zero good intent in that text! It’s rude and condescending. WTF is with creating four speeches? Only a narcissist would come up with this grand idea. He’s not even sharing it as an idea , he’s giving a directive. Gross old loser.

On the parents, they probably want OP and the kids to spend more time there and while they are there be available as often as they are available. This doesn’t work as the older parents are retired with nothing to do and their adult children are working and taking care of the kids. If you want people to stay with you, you have to be a reasonable host. Pouncing on someone first thing in the morning when they are trying to wake up, get kids ready and get ready for work is not good behavior.