Make sure this is in your lease agreement.  

Alternatively, your sibling might use a 1031 exchange to defer taxes by reinvesting in like-kind properties, though this doesn't directly fund a primary residence.Other ideas include leveraging a HELOC on the rental properties for the down payment, taking out a 401(k) loan, structuring an owner-financed agreement, or a lease-to-own arrangement.

Park owners always own the land, sometimes they will own the homes and rent/lease them to tenants.

Quote from @Caliana Johnstone: Realized leasing to a new tenant can take 5-10 hours easily.

Unless I'm mistaken, the contract between owner/landlord and PadSplit doesn't have a defined monthly rent but a target/goal of monthly income (so it's hard to use that as lease).

Whether we agree with these items or not, the following are inflationary government policies: stimulus, student debt relief, tariffs, increased child tax credits, limited immigration, and big government deficit spending.

A furnished mid-term rental or month to month lease can be well worth the small incremental monthly cost for this flexibility if you are serious about finding a great live in flip candidate on your timeline, not that of your employer's. 

Ensuring a solid lease agreement and security deposit will help mitigate this.

I was told that I have to use the lease value * 0.75 until there are two years of rental income.

And given #3 above, it leaves about 20% of rent for all other expenses like property tax, insurance and other PM expenses like leasing fee, eviction fee and other minor expenses like for e.g landscaping, pest control etc.