Even if you wanted to be a partner and put $100k down, I wouldn't let you take a unit rent free.Investors want partners with skin in the game.

There are multiple ways to skin this cat.1) Create a new LLC with identical ownership2) From the "old" LLC distribute TIC interests in the improvable parcel prorata to all the members. 

I have done 2 successful flips and also have one 1 buy and hold.Now that I have a little skin in the game I’d like to ask my dad who is 62, with a 6 figure 401k to allow me to use $50,000 to invest in more real estate.

There's more than one way to skin a cat.I bought for cash flow.

There are definitely many ways to skin the cat.

It's easier to start when things are trending up.If you're starting out and still want to jump in, I'd recommend partnering with an experienced builder (minimum of 15+ homes a year) and doing a deal together where both of you have significant skin in the game.

I have done 2 successful flips and also have one 1 buy and hold.Now that I have a little skin in the game I’d like to ask my dad who is 62, with a 6 figure 401k to allow me to use $50,000 to invest in more real estate.

I have done 2 successful flips and also have one 1 buy and hold.Now that I have a little skin in the game I’d like to ask my dad who is 62, with a 6 figure 401k to allow me to use $50,000 to invest in more real estate.

While I’m taken back by your accusations of me being a thief or scammer, I have pretty thick skin and will certainly take note of some of your valid points.

If you do not have really thick skin, don't get started.With that said, you asked about the best software.