Robin likely played lead guitar for Josie and the Pussycats and toured the world (and space, depending on your head canon) all the while meeting fabulous and not-so-fabulous people. Before becoming famous she was a work-study student at the local land grant college majoring in Dendrochronology during the week and working for the Park Service on weekends.
Once fame took hold though, there was no time for those things as the life of a guitar hero is less compatible with academic and botanical pursuits. Her fiancee however tired of the jet-set life and gave her an ultimatum that it would either be music and glamour or him. Robin somewhat regretfully decided that the crazy life was something best left behind before it leaves you in ruin, and settled down. Little did she know at the time that she was pregnant and that the fiancee would be a bit less happy to be sharing Robin once again with someone else. In a pique of stubbornness and self-interest, he left both of them.
A grounded Robin changed her hair and outfit and returned to school with a newly born son and took on what classes she could with the time that she could eke between feeding, changing, and squalling. There she met another young scientist who was not sure he wanted to pursue the default pathway of grad school, postdoc, faculty/industry. Their common love for finding things out scientifically spilled over into finding out about each other and soon they fell in love. They split time caring for young Sebby and finishing their degrees and once done, Demetrius and Robin had a chat about The Future.
They had an uncommon opportunity.
Fresh out of school, they didn't have debt thanks to Robin's successful music career but didn't want to do the rat race thing they saw so many of their friends work themselves into knots about. Instead they looked for a place. The Place. Where maps show green and interstates stay well away from. Where the AQI is stuck at 0 and not everyone knows your stage name. Where you can just be you, and you, and me.
And a few years later, another you named Maru came along.