To expand on what @Joe Villeneuve posted above, you should form one ownership entity LLC to hold title to the property (if your Lender consents to an LLC owner of fee title) that is controlled by an operating agreement between two (2) separate LLCs as its members (one LLC for your interests, and one for your joint venture partner's interests).

If there is a mortgage, you will need to get the lender's consent to assign the mortgage to you, or you will otherwise need to refinance the property and simultaneously convey the property from your Aunt to yourself by a "no consideration" deed. 

If so, he can't consent to anything, only his mother can.Second, the only people that can do anything about the situation are heirs or their parents/guardians.

Do check your lease agreement for a sublease clause, but there's no mention of it, I would contact your landlord to obtain their consent.

However, when I went to sign documents, one of the forms my agent gave me was an acknowledgment/consent to dual agency. 

(I don't want to waste time building something if it doesn't at least make sense to some)Note: this isn't an advertisement, and I don't plan to advertise without consent.

As far as notifying the Tenant of your upcoming inspection, if they typically reply to you via email, use email (it doesn't matter whether they consent or not; it only matters than any reply is a confirmation of receipt - ensure it's the same Tenant email address used in previous correspondence), you can use text as well but not as your primary, if they don't reply via email send your inspection notice via USPS with 'proof of mailing' (allow time for deliver before inspecting @ 7 days) - highly recommended in this situation regardless.

If you ignore the issue after it is brought to your attention, that can be seen as implied consent.

The LLCs should have documented their consent to you replacing one loan with another.Various complications are possible, depending on the details of your setup.

Allows for tenants to change locks (after written consent).