Your spouse will possibly be able to be descendant (or entitled to the rights of survivorship), but a sole proprietorship is, by definition, sole and not joint. 

I don't have the specifics yet, but if I present the right deal, I can joint venture and purchase them, etc.

If I'm making roughly 90k joint income with my wife and we own a home already paying roughly 2400$ monthly for our mortgage what would be the best way to get into this what should I consider and what should I know I'd like to go through with rentals rather than flipping but where do I start?

Our joint long-term goal is to create a cash-flowing RE business. 

Joint venture - find a partner or two, pool resources, and look for something a bit bigger than you'd normally try to tackle.Oh, and once you have a day job, don't quit until you've got substantial income from your real estate side hustle.

My student leases are all "jointly and severally", and are the same leases I use for more traditional tenants.

She had knee surgury before and she says now becuase of the way the accident happen she needs knee surgery again.

I will be offering the finance (it beats funds sitting in a bank account at 0.05%) and will ideally be seeking to do a Joint Venture with someone who had the expertise to offer.

On the other, a Chinese partner would give you the ability to open a Chinese company (Chinese ownership or joint venture is a requirement) to manage transactions and provide a tangible business center to engage clients as you grow.

I've met some great people there, and potential joint venture partners!