Unless you've ringfenced and have evidence of ringfencing your personal inheritance assets, it all goes into the same pot. Your personal savings not inheritance in your name or is name or children's names (name is irrelevant) again into the same pot. House into the same pot.
If you add all your assets up, also pensions on CETV values, also a real valuation on your house, then divide by 2 and you get the starting point for division.
You can argue your "need" is for a greater percentage, if you need that greater percentage to cover housing the children for example.
If you're interested in keeping the house and it's equivalent to 50% or 60% whatever of the complete assets, you can argue that you keep the house and he takes his percentage in terms of investments / savings.
My husband left me and 4 kids. He then took me to court several times to try and force a house sale and asked for 55% of assets for him alone whilst me and 4 children he expected to survive on 45% of assets and in court papers suggested we downsize to a 2 bed. We'd also saved a considerable amount of money for the children, about half at that time in the children's names, half in our names, but the money had been in all sorts of accounts over a 20 year period. I tried my hardest to get the judge to ringfence that money, he did accept some of it as purely the children's and my husband admitted under oath indeed it was the children's. However, the judge summized that when their father walked out on them, children will suffer and in this case the suffering meant the children had to give some of their money to their father for division. So I succeeded in ringfencing some but not all of their money, he agreed to ringfence only the money in child trust fund which had always been in the child trust fund, the rest was forced into the family pot and their dad got 37% of the children's savings. It wasn't the worst deal financially, as I'd succeeded in getting 63% overall of family assets,when he demanded 55%, but morally it felt very very wrong for him to get some of that children's money. I have vowed to the children to replace all that their father has taken and in 2 years time I will have succeeded in doing so.
Sadly OP you may end up in a similar situation of watching assets which might mean more than money to you, ie the inheritance money, taken and divided. I had inherited 3k and didn't even both arguing it was "mine" alone, I just knew it would get nowhere, but it also hurt me he took my parent's inheritance in part. It sucks.
I bought an online book on how courts divide up assets to guide me. I self represented. Not recommended in some respects, but when your husband empties your accounts including all the children's accounts he could get his hands on, there was no cash available to pay a solicitor!