Home Loan from parent to child to build new home - how to report interest paid on both sides

I am the lender on the home loan/mortgage for my child/their spouse. It meets all the proper criteria (loan is secured by property, loan doc exists, formalized, etc.) for deductibility. They purchased the land outright and used the money I loaned them to build the house on the land they own.

Do I need to issue them a 1098 for mortgage int paid, as home lending is not my main business, this is the only loan I've done/had like this. If so, how? and If not, do I simply report this as interest income (which line on 1040)?

And how do they report this if I do not issue them a 1098?

Thanks in advance for the advice.

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