Private equity lending

[Edward Segaar]

Not sure if this is the correct place to post this.  I have the opportunity to help a family member be part of a joint venture with them putting the down payment down.  They aren’t able to get a mortgage themselves so they would provide the money while the mortgage and deed would be in the others name.  An agreement would be signed, and the property would be sold in 5 years and proceeds split up appropriately. How would this be accounted for for general accounting and taxes?  Would an attorney be needed or another professional?  Still very new to all of this and want to do it right.