Is it permissible to kiss and embrace one's brother through rada'ah (milk-kinship), or one's paternal uncle or maternal uncle, upon meeting them after a long period, without lust, but rather out of affection and mercy?

"Breastfeeding establishes a prohibitory kinship akin to blood kinship, as the Prophet, peace and blessings be upon him, said: 'Indeed, breastfeeding prohibits what birth prohibits,' and 'What is prohibited by lineage is prohibited by breastfeeding.' Therefore, a woman treats her brother through breastfeeding as she would her brother by blood, while refraining from seclusion, handshaking, and looking if there is fear of temptation. As for kissing between unmarriageable kin (mahrams), its ruling has been previously mentioned."