虽然我小时候奶奶对我不好，但毕竟她是我奶奶，所以我还是会照顾她。 — Chinese Grammar HSK 5 flashcard

Although my grandma was not good to me when I was a child, after all, she is my grandma, so I still take care of her.

sūirán wǒ xiǎoshíhòu nǎinǎi dùi wǒ bù hǎo，dàn bìjìng tā shì wǒ nǎinǎi，suǒyǐ wǒ háishì hùi zhàogù tā 。

Expressing "after all" with "bijing"

毕竟 ⋯⋯ / 虽然 ⋯⋯ ，但 + 毕竟 ⋯⋯ ，(as a result) ⋯⋯