Hi BM, we have had some lovely holidays in our little touring van, only secondhand but it's beautiful inside, with own loo, full cooker and fridge and comfy beds!
Can really recommend this way of life as a relaxing holiday providing the weather is good, not so much fun trekking across to the shower block or to fill the aquaroll (water tank) on wet days in mud!!
If you do get one please FAO me and I will recommend a lovely peaceful site on the East Coast we use. Just remembered about your grandson though, it is an adults only site, no children, but it would be perfect if you want a few days away on your own - and not far to go either (only 77 miles from us) so probably less from you.