I don't want my sons to be alone. I long for them to have wives and families.
Can I say, kindly and gently, that this is about what you want and your, perhaps, limited idea, of what makes a happy life.
What is so dreadful about staying single? Look at the divorce rate. Is marriage necessarily a safe and settled life?
I am married with2 children and 2 grandchildren, but most of my friends, from school onwards have stayed single, I have 2 sisters, one never married, the other did not marry until she was nearly 50. My own daughter decided before she was 20 that she preferred to stay single and childless.
When I look at all these single women today I see happy women with strong social circles, close friends, deeply embedded in their collateral families. Most are retired now after successful careers
Perhaos you need to rethink what makes a happy and fulfilled life and encourage your sons to break out from home, establish their own lives, living away from home. The more they build independent single lives away from home and put marriage and family on the back burner, the more likely it is to happen.