I want my parents to get back together.

Since I was a child, my grandparents took care of me. My parents got divorced over a shallow reason or maybe I just didn't know the truth behind their separation. After 20 years of being separated, my mother told me my dad started communicating with her. My dad didn't remarry after a long time and so as my mom. However, they are in a bad blood situation as far as I can remember. I heard them one time arguing about international dating blogs. I didn't know what happened between them. My father started to talk to my mom often when he visits in the house. I have no idea what's going between them but I'm glad. Is that a good sign that there's a bigger chance they'll get back together? Please tell me it is.