Swapping a primary residence for another primary residence

Can any one give us direction on where we can find out about swapping our primary residence with another family for theirs? We are interested in a house that is larger and worth more and that home owner is looking to down size. We want to make it an advantage for both. All we can seem to find is information on swapping for 1031 exchanges and these are NOT second homes for either of us.

Are you based in Ireland?

Are they members of your direct family?
What is the difference in actual value between the 2 houses? A smaller house might not necessarily mean a cheaper house as this depends on location and condition.

As per CCOVICH's post it looks like a US based query ("1031 Exchanges") so is unlikely to get useful feedback here since this site is focused mainly on Irish personal finance and related issues.