The moral could be about the importance of focus and not daydreaming. The little milkmaid kept thinking about the future and lost what she had in the present, which shows that we should concentrate on the task at hand.
In the little milkmaid story, the most prominent character is the milkmaid. She is the focus of the story as we follow her actions, her daydreaming, and ultimately her misfortune. There could be some implied characters in her daydreams, but they are not as important as the milkmaid herself who is the main character driving the plot forward.
One moral might be about the importance of humility. The milkmaid is perhaps a bit too full of herself as she imagines all the grand things she'll do. When she fails, it shows that we should be more modest and not overestimate our achievements before they actually happen. It's a reminder to stay grounded.
An uncle-in-law refers to your father's brother-in-law or brother-in-law. So if your uncle-in-law is your father, then he is your father's brother or younger brother.
My uncle is a soldier, and he's also the person I admire the most and have the greatest influence on me. His uncle's family was from the countryside. He had suffered a lot when he was young, but after he became a leader in the army, he never regarded himself as a "leader". He always did what he asked the soldiers to do first. Last year, his uncle participated in the military competition, but a few days before the competition, he was accidentally injured in training and had several stitches in his head. At that time, everyone advised him to give up the competition, but he still insisted on participating in the competition with his injury and achieved the good results of the military region's all-around first place. I admire uncle's strong will and his spirit to challenge himself. Uncle often tells me stories and teaches me the principles of life. Uncle is very good to me, but sometimes he is very strict with me. I remember one time when I went shopping with my uncle. I thought he would take a taxi, but he led me to take the bus. He even told me not to waste money if possible.
The moral is not to count your chickens before they hatch. In the story, the milkmaid daydreams about all the things she'll do with the milk she hasn't even sold yet. She gets so caught up in her fantasies that she accidentally spills the pail of milk, losing everything. It teaches us to focus on the present task and not be overly confident about future gains without actually achieving them first.