Does the subject want to ask, "How can I express my gratitude for inviting my sister to dinner?" Express gratitude, gifts and invitations directly.

1. Express your thanks directly: You can express your thanks to your sister directly after dinner, or by phone or text message. Thank you for inviting me to enjoy such a delicious dinner.

2. Gift-giving: If you want to express your gratitude better, you can consider giving a small gift to your sister. For example, a book, a box of chocolates or a cute little toy. Attach a thank-you card and write down your thanks to your sister.

3. Inviting your sister to dinner or other activities is also a good way to give back.