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Hi. My name is*****'m looking at your question now and will post my answer or ask for more information here in a short while.
Your daughter cannot be held personally responsible for her husband's tax debts. HMRC cannot touch the house she owns.
As for your son in law, he should bite the bullet and take professional advice to get an idea of how much tax and national insurance contributions he owes with a view to making a disclosure to HMRC. It will eat away at him and put a strain on his marriage if he doesn't.
I hope this helps but let me know if you have any further questions.
Thanks. I hope it helps put your daughter's mind at rest.
Would you mind rating my answer before you leave the site please.