Imam Kazim (a.s) said: “It is fine to kiss your relatives whom you cannot marry. You can kiss your brother on his cheeks and kiss your leaders on the forehead.”
عن أبي الحسن (عليه السلام) قال
من قبل للرحم ذا قرابة فليس عليه شئ، وقبلة الأخ على الخد، وقبلة الإمام بين عينيه.
Similar narrations
Al-Kāfi #668“Whoever of the relatives kisses a relative out of compassion he has not committed any offense. A brother may kiss the cheek of his brother....