Thank you for your reply.

You can use parents' DX status as a binary trait to correlate heritability in the offspring.
--> Could you please tell me how to prepare the phenotype file?

On the tutorial video, I could not find how to add parent's trait and IDs.

for example, if I want to study the heritability of hypertension between parent-child relationship, where should I put the parental hypertension status?

Thank you