Adding a partner into a real Estate Deal

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I have a somewhat complex situation that I am trying to work through and wanted to ask the bigger pockets community for some advice. A little background on the situation is that 14 months ago I purchased a rental property with my father. 6 months ago I purchased another property with my father, brother In-law and I under and LLC. We have been discussing adding my brother in-law onto the property purchased with my dad and are trying to come up with a fair value for him to buy into the property so then we can move it under the LLC.

The property we are looking to add in my brother in law was purchased at $137,500 and when including 25% down, closing costs and fix-up costs my dad and I are all into it for $42,612.  The property is now worth $210,000.  My dad and I have discussed what would be a fair buy in price and are thinking about it in different ways.  I was hoping the bigger pockets community could help us come to a reasonable price.