it will be 84.5 degrees

Don't think there are any pubs like that in Marbella, are a few in Puerto Banus but the drinks are usually pricey. Fuengirola and Benalmadena are the places for fun pubs.

There's a nice pub by the promenade (Marbella) called Ocean's Eleven. It is right next to the Banana Tree (which I don't think it's what you are looking for).

There's a singer every night who is a wonderful entertainer (quite a nice chap, and very friendly, he sings almost anything). Prices are very reasonable, low I would say. The pub has an attached restaurant where they serve excellent food (however, don't order the lamb ribs! ).

Regarding the kids, it's quite normal to see young couples with their kids in the bar. Some are running around and others like to sit quietly in front of the two internet connected computers. Those that are allowed by their parents, go and play on the beach right in front. (I don't know how they've solved the non smoking issue having to do with the new regulation in force). Mature people also like the place, as it is a relaxed atmosphere and not too crowded. The singer fulfils without problem their musical requests (Frank Sinatra, Elvis, etc).

I think the place is worth a try.

In Puerto Banús you have Marvellous, which is not bad, but definitely not for kids, and much more expensive.