I have been married for several years and am a full-time working mum of two (one toddler, one baby). My husband brought a lot of assets to the marriage (about £3m), the result of years of hard work. I brought assets too, but a fraction of that amount. Before marrying, I signed a prenup which left me with half the share of assets generated during our marriage. I am now asking to have that prenup replaced by a more generous postnup, as, if we were to divorce now, the settlement outlined in the prenup would leave me with assets of about £500k, of which about £300k would be my own savings. £500k is a lot, I know, but wouldn't be enough to buy a house in our local area where 4-bed houses cost £1.5m. I am asking for more, but my husband says I don't need it because my earnings have taken off since we married (I now make about £500k a year gross of tax) and I can afford to take out a big mortgage to make up the shortfall. AIBU to ask for more? I just want enough to buy a home for me and the kids without having to stress about a massive mortgage. He makes roughly the same amount of money a year as me.