He is obliged to pay child maintenance at the CMS rates which are here
Do read the whole document but the basic rates start at the top of page 18.
Child maintenance is reduced by 1/7th for each 52 nights that the non-resident parent has the children.
There is a possibility of a liability for spousal maintenance, maintenance paid to keep a spouse , as opposed to children. Although most commonly paid from husband to wife, that is not necessarily the case. Spousal maintenance is based on both incomes, ability to earn money, previous lifestyles and most importantly, need. It is not about equalising incomes. There is no exact formula, but these links will give some reading..
And here is an interesting and informative article with regard to the division of finances in general
And finally, here is an article what happens to inheritance in the event of a
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I am not certain whether that answers the question for you or not, but I am happy to answer any specific points arising from this.
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