How to identify head of household from PUMS files?

Hi all, 

I'm using the ACS 1-year PUMS files (2018) and am trying to determine how I can determine whether a respondent is head of household. I saw that on IPUMS there is the RELATE variable and the source variable for RELATE is the RELP variable. With RELP, does "reference person" refer to head of household? That's what IPUMS seems to imply but I'm not sure if I'm understanding that incorrectly. 

If someone would help me out, I'd greatly appreciate it!

Thank you!

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