Girls and their mums!! ..not to make a plug here or build anticipation, or anything.. but I do talk about this in my upcoming Day Game DVD's and Workshops (to be announced in the newsletter.).. so consider making your purchase real soon! 
Hey mistero.. thanks for joining the discussion BTW!
When you meet younger women in the 18 to 23 year old range during the day, there is definitely a higher chance that they will be with their mother, father or both. From my experience it's most often their mum. I used to HATE meeting a cute girl when she was with her mum. Having never dated when in high school and missing out on all that meeting the parents shit.. when I finally did start dating I would feel uncomfortable around a girl's parents in general, let alone if they were there when flirting with her for the first time. Now I find that it can actually work to your advantage.
Here are some pointers:
First off, if the mother isn't there initially then when she comes over you have to treat her as you would most interruptions. Acknowledge her, introduce yourself, and bring her into the conversation. If the mother doesn't like you she will become the pull-away girl. Some parents can actually be quite cold if their impression is that you are wrong for her daughter, or if she sees you flirting too strongly.
Again, from my experience it's far better to actually shift your focus so that your conversation is primarily between you and the mother, while keeping the girl in play. (You know I don't think I'm going to score any points with girl's mums if they ever read this on *shrug*.) I wouldn't exactly say flirt with her mum, more like be fun, charismatic, and intelligent... charm her.. and a well placed and sincere complement rarely goes amiss.
By keeping the daughter in play I mean that you should still flirt with her. You can easily leverage the conversation with the mum to convey extra value, and details about yourself to the daughter.. albeit in an indirect manner. You should certainly send teases the daughter's way. In fact, one of your best, and most disarming tactics might be to neg (tease or playfully poke fun at, or make a joke at her expense) the girl in front of the mother as soon as the mother interrupts.
Some mums are more protective than others so you have to become good at reading the situation. Some mums might be looking for a 'nice' guy for their daughter, or even a replacement boyfriend for her if she doesn't like the current boyfriend. In those cases she will be on your side.
Others might find you disarming, but not necessarily suitable for her daughter. Perhaps no man is suitable in her eyes.. whatever the case if it's not a strong green light then I would recommend only going to an email or social networking link, over her phone number, when in front of the mum.
I can remember several occasions that I met absolutely beautiful girls that were with their mothers. One time in Sausalito, CA. I had just parked my motorcycle and stopped them to ask if they could recommend some place to eat. The girl was sending me IOI's like crazy, and I was pretty much just talking to the girl. Looking back it was obvious that the mother didn't want her daughter to hook up with me. The daughter was oblivious, but I can still picture the scene. Yep, she said they had to be going, and pretty much pulled the daughter away.. who btw turned and looked back at me longingly.. sigh..
Oh.. one final thing.. HAVE A REASON! if you have a legitimate (at least sounding) reason to stay in touch with the daughter, then her mum is much less likely to interfere. .. but remember this, a mum can sniff bullshit faster than a Basset Bleu de Gascogne can sniff out a rabbit on a hot summer's day!
