Where do I continue from here? 

Should I continue to pursue it as another avenue of wealth?

Those 2nd opinions can guide you on whether to continue following your agents lead or pivoting to what you believe. 60 days without an offer can be nerve wracking if you need to sell but, in a lot of markets, is not unusual.

Put the 50K into a income fund and continue to contribute to it for the next 4 years.

Then we decided to remove all carpet and continue hardwood floors along the existing hardwood floors.

To go along with what others say it is probably best to avoid lending to family members, unless you willing to lose it all (and still continue to have good relations). 

I would recommend continuing to learn and building up your savings.

The key now is to continue to grow your portfolio and pay off those properties as fast as you can!

You are banking on it continuing. 

Rent-o-meter shows good rental comps over in that area and as W.Phila starts to develop, properties continue to appreciate.