Calculating on using cash savings only. As this will require two separate applications will each application require proof of £46,500 in savings held for 6 months total £93,000, or can the same £46,500 be used for both? Or would £72,000 (spouse + child) come into the equation anywhere?

FLR application was under spouse name as son was under 18. I assume son will require his own UKVCAS account for ILR?