Opinions please - fair sharing of assets

I am on my second marriage. We both have 2 grown children from first marriage. My husband has a larger pension than I. We pool our pension money into our day to day spending pot and his makes up 3/4 of the total . We own a house with my parents (live in half each) and I will inherit their half when they die as an only child . My husband thinks the house should then go completely in joint names between him and I, so we own half each at that point. He will leave his half to his children and I leave my half to mine. We have Will Trusts protecting our portion of any assets for our children . My question - is it naive or completely fair to split my inheritance this way ? On the one hand he supports our day to day life more now, but on the other if for some reason we split up then I have given half of my inheritance and future security away ? Other financial contributions have been made into the joint pot by me in terms lump sums and redundancy payments so I have made some contributions over and above my small pension to current financial position. I’m trying to find a fair way forward. My father has already died and mum is frail so this may be an imminent issue.