Buy a SF home from family to rent

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I am seeking to buy a 3/1 SFH in N Central FL from my in-laws in order to rehab and rent. A few questions:

1.what is the most tax efficient way to acquire the home for both me and my in-laws?
2.if my in-laws think the home is worth $60K, but it probably needs $30K of work to get it to $60K, what is the best way to explain that? Is there a downside to ordering an appraisal?
3.should I ask them to carry the financing at a low rate for me? I think they will do that since they are retired and may like the income stream
4.any ideas for acquiring, fixing, financing a home from family members without rocking the boat (there are other siblings and I do not want to be viewed as having ripped them off - I will not do that)

Thanks!