It was narrated that 'Abdullah bin Mas'ud said:
"When captives were brought to him, the Prophet (ﷺ) would give the members of one family together (to one person), not wanting to separate them." (PT)
English reference (PT): Vol. 3, Book 12, Hadith 2248 (PT)
Arabic reference (PT): Book 12, Hadith 2333 (PT)