suī / rán / méi / yǒu / xuè / yuán / guān / xì / dàn / liǎng / wèi / lǎo / rén / qíng / tóng / shǒu / zú

虽然没有血缘关系，但两位老人情同手足。

Although they are not related by blood, the two elderly people are as close as brothers.