Rascal Flatts' Jay DeMarcus has his hands full.  He's busy on the road with the band and when he's home he's daddy to two kids.  His son Dylan is almost 6 months old and is full of laughs.  Jay Tweeted this adorable picture saying 'Our baby Dylan is the happiest baby ever!!!'

He is looking extra cute sitting up on his own, with the biggest grin.

Dylan and his sister Madeline Leigh, who is now 2 years old, are keeping mom and dad on their toes.

After taking time off during the holidays to spend with their families, Rascal Flatts is back on tour starting January 10th in Wisconsin.  The trio also plans to head Down Under for a tour in Australia this year.