Derek Ramsay dedicates sweet greeting for son Austin's 18th birthday

Derek Ramsay dedicated a sweet greeting for his son Austin, who just turned 18 years old.

On Instagram, Derek shared a photo where they are both seen with cakes, followed by a series of Austin's shots while growing up.

The actor also shared a photo of them hugging from when Austin called him "Dad."

"My little boy turns 18 today. We have had are ups and downs, son, but you know that I love you and I will always have your back," he wrote in the caption.

"Enjoy over [there] in Dubai and I'll see you soon. Happy birthday," he added.

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On Sunday, Derek also celebrated the third birthday of Elias , the son of his fiancée Ellen Adarna with actor John Lloyd Cruz.

Austin is Derek's son with former wife Mary Christine Jolly. According to a GMA Network report , the the actor revealed in 2014 that he was married and has a son.

—Franchesca Viernes/MGP, GMA News