First, sorry for you loss.
Financial advice is so dependent on the recipient and their current state, so please take this with a grain of salt. You mention you both work (full & part and I hope that is going well in this somewhat trying time). You don't mention bills other than the mortgage. You don't mention your investing skill.
There are Dave Ramsey folks that follow the baby steps (this is an RE site, so not that many here). I happen to like Money Guys, but not there stance on RE. Are you emotional or mathematical? If emotional, pay the smallest bill and pay off that mortgage. If mathematical, consider the interest rates when you make these choices. Say RE will net you 10% to 12% return, why would you pay off the 3% mortgage faster than needed?
Are you the type that buys the fancy watch & car today or do you invest such that the investment funds your toys in the future? I suggest the latter is a better plan, but that is not the common mindset in the US.
Say RE is your passion or direction. There are a lot of different ways to do RE. In residential, some folks wholesale, some fix & flip, some BRRR. In commercial, there are syndications for storage, apartments, office, retail. How active or passive do you want to be? Do you plan to be active or passive? Hire management or self-manage. Local or distant?
None of us in BP land can tell you what to do. We can say what has worked for us - there are many ways that it works - how it works and the pitfalls.
Here is one way, my story. And it may not be right for you or what you want. Having saved some funds, at 57, my wife dragged me to a RE investing group meeting in 2010. They presented SF and MF (single family and multifamily). I had not interest in SF, a lot of hands on. But the math behind MF made sense to me and we jumped in with both feet. We took the passive option, I invest funds in syndication created by others. I was still working, enjoyed my job, and continued to work, but kept the idea of leading a deal as a back-up if the job went south. There are pros & cons: little to no effort on my part, little to no control on my part, the location is mostly irrelevant (I have investments in 9 states), you need to be sophisticated (knowledgeable), you have to get access to folks that are creating deal (folks that you develop a trust relationship with!).
All that said, think about your options.
Regards,
Charles LeMaire