Well the obvious next step to them 'job-sharing' at the same time would be that it stops being a job share, it's just his job. Especially as he's already having all the wages.
But that leaves the problem of an unattended Helen all day - how will he get round that? It's surely not as though he can ask to 'work from home' when it's a shop, is it?
I'm sure that's what will happen, but can't work out how he'll manage the problem of leaving her alone! Oh oh oh - URSULA! She could come and stay to 'help' Helen in the difficult last months of pregnancy. Line up all the tins in the cupboard so they face forward, and so on.