If I was your son I'd get him to doube check. I think it would be worth spending a few hundred pound on a solicitor now and have all his paperwork sorted rather than a bitter divorce in a few years time
The reason I am saying this my dad re married and had been dating the lady for 5 years but only been married a year then split. Because they live in England although he is Scottish, its English laws so in England it goes back to when ty started dating she can claim money. So she now wants his pension, house, house abroad, £15,000 a year maintanence even though they have no children. Its crazy amounts which shes not entitled to but if they go to court the just might decide to favour her on the day and she gets silly amounts or the judge might take my dads side and she gets a few thousand. Whats even crazier is she has a lot of her own money having never married, had kids and she owned propert, its my dads money there arguing over.
They have had 2 years of arguing over money and still not come to an agreement so I'd say to save stress in the future, hopefully they will be together forever but thats what my dad thought and now hes in a right mess
We did have our doubts about my dads wifes plans but never said and now we wish we had. I think if you have any doubts you should say something. Me and my brother now regret not saying anything and my dads health is now affected by the stress over the past 2 years, he's stuck in a rut because he cant sell his house and move on as shes blocked that. He cant focus on anything but her and hasn't seen his grandkids since all this happened.