In Season 1 Episode 8, Mathew's the dog is involved in a cycling accident, and its not immediately clear if he survives or not - particularly as we see his body on the ground not moving. A few scenes later, and we're in a vets office - we eventually find out that Mathias is fine, with potentially 'just' some bruising.
I don't know what happens in the rest of the season, but for this episode he's fine.
Misha and Luke early on appear to be attracted to one another, without either of them knowing that they have the same father and are half-siblings. Nothing happens, but there is flirtation and they share a bed. Misha finds out before Luke that they're related, so while Luke continues to flirtation with her she is increasingly uncomfortable. Once Luke does find out, they discuss it and agree to be friends / brother and sister. We also find out later that Luke sent Misha a photo of some description that sounds to be inappropriate for siblings, but that she has since deleted it.
Stella goes to the hospital to undergo a biopsy for breast cancer, so we see her in both an examination room, doctor's office and a waiting room. There are no scenes of medical nature (eg we don't see her being examined). We do see a scan of her mammogram on a computer screen, but not close up.
I don't know what happens in the rest of the season, but for this episode he's fine.