Can I deduct Energy Efficiency Deductions if...

My wife and I renovated a barn into a home on my parents property 27 years ago. Since that time My parents renovated the other half of the building and moved in. So the barn house is essentially a duplex with separate addresses and mailboxes.

When my father passed away in 2018, the deed was changed to put my mom as primary titleholder and me and my brother as receiving the property in the event of her death. (Considerations for capital gains and so forth...)

Now we are making some significant updates to the HVAC systems and they qualify for tax credits.

All parties are fine with my claiming the tax credits because I am paying for the improvements and do live here. (Brother does not live here.) 

Can I claim these deductions? 

Do I need to have my mom and / or my brother  sign or file any documents to make sure that I can claim these deductions without complications?