I am here mostly to learn from the experiences of others, and if I get a chance to share my own, I contribute as well. 

or only start contributing those percentages once part of the 5k is spent?

Should one or more siblings not wish or be able to contribute equally at this time, what are the options?

When employees work for a company, the business is responsible for paying half of these tax costs.Ultimately, the tax code is designed to make people pay less if they contribute more to the economy.

PMs should have escrow accounts for contributions from and distributions to you.

I’m not referring to the documents to close on the transaction such as the Purchase Agreement but more to the documents between partners depending on their contribution.

I’m 25 and I contributed to my roth IRA for 3 years.

If so, what contributes to the difference?

I would approach the seller and ask him to contribute to the costs of the repairs and use the tenants as leverage.

Clearly define the parameters of the partnership and especially the contributions and duties.