To see if a person has weak Mercury in their horoscope or not, you look at their behavior. Here are a few points that you can use as a reference

• Mercury is like a kid. If you pay attention, you see that the kids lose their teeth easily. That’s the first sign of weak Mercury in the horoscope. The teeth are not strong. For example, your teeth are sensitive to cold (numbness or pain) with eating ice cream or an ice cube. You can check your chart 😉
• Usually, kids ask a lot of questions. A person with weak Mercury in the chart does not question when they don’t know how to do a certain thing. They just sit, trying to solve the problem on their own until somebody comes and shows them the way. Weak Mercury does not reach out for an answer. Curiosity is lessened.
• What will a kid behave if we take their toys away? They probably scream or cry. Similarly, weak Mercury gets anxious, mad, or nervous easily. They don’t know at that moment what to do. (and do not ask questions)
• Like a child asking for chocolate while parents are talking about something. Weak Mercury will cut the flow of a conversation of others, jump in between, and speak. (It’s not their fault. It’s just how they are born. Now you know the reason.)

If Mercury is alone in any house, even if it’s strong and exalted. The person still struggles to find a direction in life. The kid does not have a sense of direction in life; therefore, Mercury will follow any planets that are in the same house. Most of the time, it’s good to have Mercury conjunct with another planet in the chart, except with Mars. All of the other 8 planets are fine.

Side note: Saturn is an old man. Mercury is a kid. If these 2 are associated in all 3 charts, D1, D7, and D9, the native does not have children. Not even with Jupiter’s aspect. Make sure the birth time is 100% correct before seeing the childbirth in a chart!