What is the ruling on a brother kissing his sister on her cheeks after traveling, or on Eids or other occasions, and what is the evidence for this?

A man may kiss his sister upon returning from a journey, provided it is not with lust. The Hanbalis qualified its permissibility by stating that it should not be on the mouth, as that is a place where lust is likely to occur. Some may view the kissing of maharim as absolutely forbidden, as a precautionary measure to prevent corruption, given its widespread nature. Therefore, refraining from all forms of kissing is closer to safety.