Back to (older) post by bunkfree: they say isotype not isotope. Here is what I found on net (Wiki): To be an isotype of a particular gene family means to belong to a set of genes that encode functionally similar proteins. Usually, isotypes that belong to a particular gene family are duplicate copies of the same gene that arose because of a mistake during DNA replication. As the species continues to evolve, those duplicated genes are passed on from generation to generation until every member of the species has a copy. Each of those genes have since undergone mutations of their own, such that they diverge slightly in structure and function, giving rise to the different isotypes known today.

Second one looks like Kalanchoe blossfeldiana, which could use more/stronger light (the leaves are pointing down, rather than upwards with deeper shade of green).

Photo #2 is a Kalanchoe daigremontiana - it propagates prolifically from tiny plantlets growing alongside the leaf edges (you could see couple of babies on one of the leaves). In some areas, they could become weedy :)

It's kept on a back porch in full sun, I think you're right about it stretching. And i believe the plant is a senecio articulates, thanks for all your help!