Trying to come up with a tattoo idea that a) incorporates my daughter and granddaughters birthdays and b) is expandable.

I don't have any tattoos but I'm considering my first. I want something that can use my daughters birthday as the base and then my granddaughters birthday as an overlay or attachment to it. It could also be their names. I also want it to be expandable should she have more kids. I don't want to go with the typical trees or infinity loops or other things that are everywhere. Anyone have any ideas?Ps I'm a guy so I'd also like it to be more on the masculine side vs flowers or rainbows. Nothing against them, they're just not my style. Thanks! https://ift.tt/2ZkEXvE