I was in a similar situation although my kids are a few years older. UC couldn’t give me a definite answer. Things settled down a bit, so it wasn’t so crucial. As far as the 5 weeks goes, I went from a sole claim, to a joint and back to a sole claim and my claim periods didn’t change. Do you get paid on the same day each month. I know it can cause an upset if you get paid at the start and end of a claim period because it happened to me. Also when I went from a joint back to a sole claim I was able to get an advance which helped.