There is a scene in episode 5 where june finds clem on top of candy. Candy is stated to have been only 13 at the time, and clem is visibly older. Based on june saying he is not a worthy man, he is presumably at least 18
It isn’t confirmed, but Agnes does go into the ocean as if she’s going to drown herself in some of Alice’s flashbacks. She ends up coming back to the beach unharmed.
Yes, but not greatly so. In one scene, it's more closely related to one of those 'rituals' in shows where hands are cut for bonding with others, rituals, etc, and in another, a character with a scar from that 'bonding', reminisces and scratches at it enough with a nail to reopen the wound and draw blood.
There is a “blood bond” where Clem and Candy cut their hands. The scene is shown in episode 5, I believe, in a flashback; is mentioned in a prior episode.
There is a cut in the hands of both Clem and Candy that you see happen on screen as a pact of some kind. You also see Candy thinking about it and smearing blood that you find out she imagined on her palm.
It isn't clear but after a traumatic event with a fire and parents dying, it's mentioned that the child has likely got Anxiety and PTSD. Anxiety is a Mental Illness and PTSD is defined as that or a disorder/mental health condition
(Not yet as of 4 episodes in)
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A child ALMOST drowns (panics and struggles) TWICE, but neither times resulted in actually drowning. They can still be hard to watch though, and one of the times comes under domestic abuse/violence as it's a father that pushes the child into water on purpose
There is mention of a woman who had her wedding ring cut off her finger by her abusive husband, but it's unclear if that meant the ring was cut or the finger, but we don't see it regardless.
In Episode 3, you meet Dinah and her baby who come to the farm to escape her abusive husband. By the end of the episode, it is revealed that they went back to him.
There are several occasions when child Alice displays PTSD from her abusive household. One in particular during episode 2 after she hears Twig, June, and Candy fighting.
Flashback of June catching Clem and Candy having sex in the shed, but no nudity. Alice and Dylan have sex in present day after the dinner party, both nude but you don’t see much.
It's not clear (yet- as of 4 episodes in) but it's heavily implied between two people growing up as siblings (not blood related though still isn't good) in flashback memories (not in the present).