Hannah Montana Party

Last week Tyler came home with an invitation to Jenna's Hannah Montana birthday party. A couple of days later he brought home a paper with some directions to the party and the headline said "Jenna and Jessa's birthday party". I was wondering about it being for two girls so I asked Tyler, "Do you know both girls?", he says "yes mom", volunteering no further info... I push further!! "Are Jenna and Jessa's birthdays close together?" "Are they close in age?" Tyler responds with "I don't know mom"... I inquire farther!! "Tyler I know Jenna is in your grade, what grade is Jessa in?" Tyler looks at me... "Mom, they are twins!!"