More than half of my family's net worth is in RE and I only see that increasing if we continue to buy properties. I don't see any problem with this # being 60-80%; however, what worries me a little is that it's all in residential rentals in one area of one fairly small town. This particular town has a great rental market now and only a 4.2% unemployment rate. However, if something were to happen to this town (a major employer goes out of business, for example) that would significantly hurt the rental market.
On the other hand, I've invested her for a reason. I have a team in place here, my husband and I know the area well, and it's easier than most places to find good cash flow. We invest in RE part-time and have full-time jobs, so we don't have the time to do the due diligence to find a new area to invest.
Overall, I think we're better off continuing to buy property here as long as it's cheap enough. We buy conservatively so we should be ok unless the most doomsday of scenarios occurs. I do have to stop and think about whether we're going overboard at times.