OP, yanbu.
But you have a choice now in how you respond.
Avoid them as much as you can.
Certainly do not allow them into your home under any circumstances.
Get a video door bell installed and make sure your front door is locked and you have a secure gate to your back garden.
They chose to be weird, you can choose your firm boundaries now.
You do not owe them any additional contact or interactions.
I consider their behaviour extremely weird.
You can't change what they have done, but you can guard your privacy.
Keep anyone in the family who will pass on your business on a firm information diet.
Hopefully they will keep their distance.
They have blocked you?
You can choose now never to respond to them again.
Never entertain any requests re childcare etc.
When family are weird, best to keep your peace by keeping your distance.
A few years ago my friends pain in the arse brother that she avoids like the plague, a complete wind bag know it all, moved 10 minutes from her, too close, and decided that they will now take to visiting unannounced.
She spelt it out so clearly the first time it happened.
She was not interested in any additional contact to the aannual polite contact when they might cross paths and she wouldn't tolerate any interference in her family life.
He tried to act offended, but in 20 years she has had very very little contact, very deliberately.
He's 8 years old and she has never liked him, so she simply refused any effort to up contact.
He tried to act surprised with her parents but they knew well what he was like and said it was nothing to do with them.
5 years on it's strictly a nod and wave if they very occasionally meet.