Understanding Society User Support

I am analyzing effects of divorce, and the outcomes I am investigating are the household income, education level, health and structure of own family - which is why I am using *_indresp, so that I have the adult responses from the "children"

For analysis, I would like to control for the household income, education and SES of the parents, which is why I need to be able to connect *_mnpid to the *_pidp - which I have been able to due with the syntax on your data management page.

To have the largest sample size possible, I would like to combine BHPS and US, and it is here I'm running into trouble.

I can use the syntax provided by you to combine the harmonized BHPS to US, but then I can't figure out how to match children with their parents. I have tried using the syntax to match children and parents in each wave individually, and then use the syntax to combine BHPS and US, but I keep getting error messages.

To sum up, is there a work around, to be able to combine both BHPS and US as well as matching children to their parents?