A nice line for prospective parents-in-law, from Abigail Shrier (crediting a friend of hers) in her Free Press advice column.
One more item from the same column—the person seeking advice, about what to do about her 22-year-old daughter's prospective impending marriage, included this in her question:
[G]iven that these two are facing certain separation for a couple years, I feel like her fiancé proposed in order to tie her down. To take her off the market.