Am guessing on the last two, the 1st some kind of Rhipsalis, the 2nd some kind of Epiphyte. I'd suggest the pots for the last 2 are rather too big (tho' I see you got this nice, chunky mix which is likely to be fast draining). Pls. excuse me for not wanting to repeat all the tips for Holiday Cacti (both Thanksgiving & Xmas). Pls. search around here for the posts which include a link to "Holiday Cacti", the excellent link which is so often provided here. They explain care & culture better than I could. As to the Jades above, other than feeling like your BIL should not have watered in new cuttings, I'd leave the rest of that to others as well. Just pls. do a search on Jades or Crassula ovata in the meantime, as there are mountains of info. on this posted right here. My short answer on the Jades is since he watered them in, I would NOT water them AT ALL until I saw new growth, but perhaps others will feel differently. Good luck w/ them all!

Did you mention where you live? (Good idea is to put general location and/or growing zone next to your name...) Yes, Sempervivums could be grown indoors but usually they don't look their best. I am not sure if they are better off with having to spend winter outside (some plants have to have x number of cold days to grow well); unless you get them really good light during winter they usually look quite sad. During summer it may not make that much difference. But amount of light is always less indoors than outdoors. But if you don't have access to garden or deck-balcony, you have to just do it indoors. Many ppl have to, living in apartments without balcony or any other outdoor space. All of the succulents need lots of light otherwise they stretch as I already mentioned about Painted lady. I use lots of supplemental lighting in winter, and probably will improve even more next winter. here is same Echeveria purpusorum, still indoors (March) and blooming, under lights: Adding more perlite definitely helps.

Yes, they are healthy, they are sempervivums aka Hens&chicks. That's how they reproduce - propagate. You could shorten up the stolons little (the 'woody' part chicks were attached to mother with), but they are not that long. I usually leave about 2-3 cm of it and stick the plant into gritty mix, all the way. Using some grit or small pebbles as top dressing will keep the leaves from sitting directly on the soil/mix. Little roots will find their way into the mix. Leave the tiny chick on (I see one growing), it is too small yet. These are hardy succulents and best if grown outdoors - potted or in ground. They should clump up, grow many new chicks.

Kara, Currently I leave both the plants at my east-facing window sill at which sunlight is available for around 8am to 10am. And I plan to increase the sunlight exposure by an hour a week. Hopefully, they can enjoy themselves =) P/s: I live in the southern region in which the weather is still sunny and not quite humid at this time of year ^^. Btw, being curious about location and some private information is welcoming here as it is part of our norms, so no worries :))) Frank, Wow, so this one is the hybrid between the Sedum and Echeveria? Patrick, Ok, so it should be fine to leave them there a week before watering again. I also wonder whether gradual sunlight adjustment like I plan is ok or it is too long? P/s: about the ID yeah we should wait for more comments to confirm. These echies are sometimes too shy to reveal their true forms, or they just love to make us confused xD Thank you all for being very informative and enthusiastic in supporting me ^^