My wife's grown daughter gonna drive us to divorce after 33 years

Married 33 years. Retired 2 years ago and we moved to South Korea. Everything is gravy. Bills paid , house paid. Debt free. But, drama followed us, that we left back in the USA. My wife's 43 year old daughter from previous marriage, has been hounding us for 20 years for cash$ Always short on rent, car payments, phone, kids school clothes,,etc. We only hear from her when she wants $$. Wife has bitched her out, I have. She even blocked us on FB twice, but always comes back . Now she needs to find a new place for her husband that dont work and 3 kids. Need 3 months deposit, security in Miami. Just found out other day. To top it off , my wife wants to leave her in our WILL/ Estate if we pass away. Since we have no kids together, I agreed. But, the kicker....wife wants to leave her daughter HALF if she passes away first , before me. I said ABSOLUTELY NOT. No way. That is my money from retirement, Military VA, 401K, etc for all my years of working. Live in my house knowing she owns half?! My wife says "but thats my half" same thing. I dont see it that way. We actually get along fine, no problems. Until her daughter gets in the mix,,,and its never ever, good.