If you can settle things between you without involving solicitors, so much the better.
If you have been the main care of the children until now, he is unlikely to get shared residence although he will of course get contact. It has nothing any longer to do with being child’s mother as it used to do years ago.
There is £510,000 of equity in the house and it depends what it would cost to buy a house for you and the children in the area that you live now, not necessarily of the same size.
You could buy a house and there would be enough money left over to give your husband some, then a sale of the house is a possibility. This is relevant to the percentage.
It’s likely because you are going to be caring for the children until they reach age 18 at least, that when the house eventually gets sold, it’s going to be split 6040. However that’s going to be at least in another 11 years when the youngest child reaches aged 18. It may be that your husband doesn’t want to wait that long for his money and hence, would take a lesser sum now.
That is probably what your solicitor was thinking of: your husband has two options, 25% now or 40% in another 11 years.
Whether the loan would be treated as a debt on the marriage or something personal to your husband for which he would be responsible, would depend on the purposes for which he took out the loan. If it was from marital purposes then it would be dealt with within the marital finances and if it was for his own wants (buy a car or motorbike to play with) then from his share.
Your husband is not entitled to any share of the property in Spain if it’s owned by your parents until such time as your parents die and you inherit it if you do inherit it. I don’t know whether that’s a likelihood in the near future. What you going to have an argument over here is this “trust” because your husband is going to allege that it’s a sham trust done purely to defeat any claim that he may have. If the trust was documented and had been documented (a UK trust deed would have been fine for the purposes of this divorce) at the time of purchase, he would have had a difficult time arguing that it wasn’t a genuine trust. It is the verbal nature of it which is a problem for you.
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