It was 4 heirs. I inherited 20% of the house. . If the house is sold for $100000 can I ask $25,000 for my share if I wanted to.

If you inherited 20% of a house and it sold for $100K then your share is $20K, not $25K. Of course you would have to contribute 20% of the expenses incurred in maintaining and selling the property, so you may actually clear something less.

First, your math isn't very good. If you have 20% that is 1/5th so, if there is a profit of $100K you would get $20K. If you are one of 4 heirs, than you would be entitled to 25% if the estate was split equally.

If the house is sold, then it depends on the status of the probate of the estate. There may be other bills of the estate that have to be paid first out of the sale. But once the estate is settled you should receive your share of it.