I made a variation of this family calendar last year for everyone in my family. Not only did I put the birthdays, but I added family anniversaries as well. I found everything I needed at Michael's craft store. It did take some time to put five of them together but everyone loved them, displays them, and actually pays attention to them monthly. Your family members will not only love it, but they will appreciate the information and love you put into making them.
Please let me know if you would like to know what items I used to pull it together. I would be happy to post that information.