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." (TR)
English reference (TR): Vol. 3, Book 12, Hadith 2248 (TR)
Arabic reference (TR): Book 12, Hadith 2333 (TR)