Agreed. He sounds absolutely disgusting. Always trust your instinct. If something feels ‘off’/creepy about someone, trust your gut response. It’s usually right.
Basically, he’s looking for some kind of sexual thrill. To put it bluntly, he wants to get you into bed. You’ve made it clear that you are not interested, but he persists, which is horrible and completely unacceptable. Let him sulk. If he wants to play the hurt feelings card, him. That’s pathetic even for a teenage boy.
All that would be bad enough. But the fact that he is employing you makes it worse. He clearly feels that because he’s paying you he has some kind of right/power. I wouldn’t be surprised if things escalate and he offers you money for sex, or even threatens you in some way. I **ing hate that sort of thing. He reminds me of those filthy scumbag landlords who offer rooms for sex.
Also, it is just plain weird for an elderly man to want to take you and your children out. Most older men can stand other people’s kids. They certainly wouldn’t want to spend the day with them. I hope you don’t have a young teen daughter. If you do, don’t ever leave her alone in a room with him!
If he had never mentioned sex, it would still be a bit weird. I guess if you’d lived next door to him for years, and had just lost your husband, or something, he might offer to take you and kids out from simple kindness. I’m sure that happens. But this is a man you hardly know who has repeatedly talked about sex in ways that make you uneasy.