Well dear, I hate to say this but I have a very successful uncle who married his second wife about 6 months after my aunt passed away very suddenly.
His kids were PISSED.
My uncle is very intelligent, a CPA, a professor, a financial planner. His new wife was not much older than his oldest child.
He was devastated at the way his kids were treating him, and her, and I told him to follow his heart and make himself happy.
Now, this woman had a job and earned her own money. Did she hit the lottery by marrying him? Yes, she did. No offense to my aunt who I loved, but I've never seen him so happy and they've now been married almost 20 years. Regardless of how much money they have, she is very frugal and she treats him like a king. After 20 years, they are madly and passionately in love and all the things his kids thought about her running off with all his money never came to fruition. She treats his enitre family so well and like I said, I'm sorry my aunt passed away, but we absolutely adore aunt #2.
You know, my first aunt was a sickly woman. She had a heart transplant but still insisted on smoking cigarettes. SHE was the type that if she got pissed off, she would just go out and by herself a new Corvette. Or throw a tizzy and charter a flight to the Bahamas. My uncle stayed by her side, health problems, blowing through money. Treating him and the rest of the family not very nicely.
They had been high school sweethearts and he worked his head off to amass an amount of wealth. She never worked a day in her life.
He met someone very, very different from her and fell in love.
I can honestly say she has given more to my uncle's life and to this family than she has ever come close to taking.
I wouldn't trade her for anything.
Seeing my uncle so happy is a beautiful thing.
Even his kids can't find anything bad to say about her because no matter what they thought in the beginning....they were wrong. And he's happy.
I'm just saying.
There was nothing predatory about the situation in my uncle's case and he has it set up to where if anything happens to him, she is to continue caring for the rest of the family they way they already do. We have other elderly relatives that they look after. She's just not the type to abandon anyone.
That's not where her heart is at all.
She truly is one of the best things to ever happen in our family. We all love her. And it's for real.
I know you want to protect your dad, but he's competent. You said so yourself.
Don't set yourself up for the "teenage" scenario where he will feel like he'll damn well like her or marry her whether you agree with it or not.
He's a grown man.
Maybe relax a bit and see what happens.
Just my opinion.