Can I sue the home inspector and sellers for failing to report a mold problem in the bathroom and foundation leaking water into the basement

You may have claims here but they are very difficult to win.  Most home inspectors include limitations of liability in their contracts.  You also should determine the scope of their inspection duties.  They may have excluded inspections for mold from your contract. As for the prior owners, you would have to prove that the mold was there when they owned, that they knew about it and failed to disclose it.  Its an uphill battle and you'll have to pay for the attorneys fees and expert costs to bring the claim and those probably won't be recovered if you win.