Are there any people from Kenya? or Speak Swahili?

I just came back from Kenya and it was insanely amazing. My dads side of the family is Kenyan they came there a long time ago when portuguese and Italians migrated to Malindi, my grandparents speak broken Italian and Swahili, My moms side of the family is portuguese from Mozambique and cape verde. I noticed that alot of Kenyan blacks from the Inland speak swahili but it sounds african, but when the blacks in the coast speak Swahili it sounds more arabic and more spanish/portuguese. Is it just a different dialect or is it a differnt language? when my dad says something in Swahili i can understand it but when my grandparents say something it sounds like a whole differnt language.