Owner must sale because of death of relative, property is clear

[Jorge Pimienta]

Hello everyone been a member for a while but I am finally thinking of pulling the trigger on my first flip/ and hopefully seller financing. I have a home that a mom passed and her son cannot afford to stay in NJ and wants to move to PA. I believe he found a place and has to move by the end of December 2022. It is a single family split level home, it is an older property. I will be able to see the inside in two days. I believe it is going to be very out dated but maintained enough for the house to be livable. 

Question is how to tackle the financing end of it. I believe I can get him to lower his price of 450K sense he did say it was negotiable. Comps are running at around 520K fully updated.

Should I ask for seller financing or what other type.......I was hoping to buy it, fix it and sale it or keep depending on the prices when i go to sale. 

Any suggestions or ideas will be truly appreciated.