suī rán / méi yǒu / xuè yuán / guān xì / dàn / tā de / yǎng fù / yì zhí / bǎ / tā / dàng zuò / qīn shēng / ér zi

虽然没有血缘关系，但他的养父一直把他当作亲生儿子。

Although they are not related by blood, his adoptive father has always treated him like his own son.