If they are getting a salary, that's probably right. The general rule is the first hire gets about 1% and it goes gown from there. But, the range for 1-10 employees is about 1-0.1%. It doesn't sound like much, but think about it this way. 0.1 percent, when the company goes IPO at a 10 billion market cap is probably 40-50 million dollars.

If you aren't getting a salary, but are working, you're a co-founder and the equity should be higher.