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They can marry as they wish but it is always important to discuss the financial implications. Generally, it will be the wife who will get everything in the event of a divorce (the law generally favours this approach) so in reality, her partner is unable to touch anything of your daughter's. This would also apply for anything you are to leave behind for your daughter and grandchildren if they are a beneficiary.
My only concern would be the home so if that is held as joint tenants, this means that if your daughter is to pass before her partner, he will automatically inherit her share of the property and eventually be a 100% owner. If they hold as Joint Tenants, then your daughter's share can be vested in her own estate as she pleases which can then pass onto her children.
I hope this helps and please leave positive feedback. If I can assist with anything else, please do let me know.
You are speaking with someone UK based. Unsure as to why it states US!
If you are happy for the husband to inherit the house as it is then that is fine, the default rule is that the spouse generally obtains all the assets upon divorce and upon her death, the assets will be as per her will (remember, in the eyes of the law, a divorce will automatically revoke the husband as a beneficiary).
I hope this helps and please do leave positive feedback. If I can assist with anything else, please do let me know.