More info might get you more replies. Such as:
How old are the children, most 13'ers only have room for 2 very small children.
How much work can you do/want to do? Do you want a fixer or turn key or ???
What do you call "Reasonable? A price range will help. If you are looking for a 5 y.o. 16' FGRV for $5000 your chances are very slim and you will have to be a lot closer than Moi for such a bargain.
And again, as above, what is the tow rating for YOUR Volvo wagon. If you don't know, check the owners manual or post the year, model and driveline.