Is it possible, and how, to merge March CPS with ASEC CPS?

[econ]

You can see the answer in the following link :

Subfamily relationship variable?

I would like to see relationships within the families denoted in IPUMS-CPS by FTYPE, ie. the equivalent of RELATE but for families not households. In raw CPS this variable is called PRFAMREL. I cannot seem to find the equivalent in IPUMS.