In the UK people pay child maintenance based upon income. W is hiding savings. I was the primary carer until W took the kids. We now have a 50/50 deal so W would only have to pay me about £150 - 200 pm.
My legal advice is that the family home would be sold in a divorce and I'd get half of the proceeds, plus some of W pension, and I'd be expected to work more (which would mean me paying for childcare for the kids rather than me looking after them and I'd still not earn enough to buy W half of the house, plus W would be entitled to some of my wages).
Consider too that W is already telling the kids what to say to the court whereas I'm not as I'm being honest about everything and I think it is terrible of W to pressurise the kids like that, so I could lose the 50/50 in a few months time.