I was busy with other things when I was engaged to eat at the wine table today. I haven't poured drinks for my parents-in-law, and I haven't brought them tea after dinner, have I?

No, you are engaged. Being young is also a big deal. They will be happy and won't care about this little detail. They are busy, too! I don't care. You don't have to worry. You can say to your mother-in-law, "Mom, isn't it a bit bad that I don't pour water for my relatives?" What, so my mother-in-law won't be angry, and she will think that you can still discuss something with him, and trust him and he will tell you. Don't forget to behave well next time. I wish you and your husband happiness forever.