They aren hens and chicks, they are a relative of theirs called echeveria. One is a alpine cold hardy succulent from europe and nearby, the other is a tropical succulent from the americas. The long ones are another relative, called sedum, or in this case a hybrid off of it. From first glance, i can see that your plant is a tad overwatered. whatever regimen you have, try skipping watering for a few weeks, and reduce the current regimen frequency to between week and week and a half. As for the pot, get coir and peat, mix with grit, gravel , pummice and pelite(at least 60:40 ratio between organic and inorganic components ). Another thing, is that succulents like these need room, and preferably to be separated.
echeveria perle von numberg
sedum vera higgins.