if your second statement is true no rich man would ever kill himself, or sink with depression.
that's why I like reading what Naval writes, about being rich and being happy. Money only solves your money problems, you can have a housekeeper, chef and personal driver and still feel miserable and with no purpose because you fought with your daughter and you haven't talked for the past 20 years, or whatever other reason
there are many things money can't solve and can't buy and these are the most interesting ones in my opinion.
That means they need Jesus.
They have money and can afford to life with good lifestyle, but they're not grateful with the thing they have and choose to suicide. Aside from Jesus, they can go to professional help.
Daughter isn't the only thing to make us survive, we need to realize setting an expectation to human is bad because there's no guarantee if we do good, we will receive good. if the daughter not welcome with you even though you've doing good for her, you have two choices, either still doing good or do nothing. Focus on other thing that make us happy.