Reform or Conservative conversions done outside of Israel are recognized, but remember you don't have to be Jewish to be eligible under the right of return.
Yeah, it's pretty wild that even though I'm a Christian, I can make aliyah because my grandmother was Jewish.
Which leads to another question - my husband can make aliyah through my grandmother also, but my kids (who are quite young yet) seemingly cannot? Unless, I assume, I convert to Judaism?
Oh and yet another one - what kind of proof does Israel require of children and grandchildren? How would Israeli authorities determine, and how would one indicate, that a grandparent was Jewish? I imagine that you can't just fly over and say "hey, I claim eligibility" with nothing to back it up.