The elderly man was a grandfather to seven youngsters and he never failed to spend time with them each and every weekend.

It said to fix the comma splice or fused sentence...how do u do that?

1. You can separate the two clauses into two sentences by replacing the comma with a period.

2. You can replace the comma with a semi-colon.

3. You can replace the comma with a co-ordinating conjunction (and, but, or, for, yet, nor, or so).

4. You can replace the comma with a subordinating conjunction (e.g., after, although, before, unless, as, because, even though, if, since, until, when, while).
5. You can replace the comma with a semi-colon and transitional word (e.g., however, moreover, on the other hand, nevertheless, instead, also, therefore, consequently, otherwise, as a result).

The elderly man was a grandfather to seven youngsters, and he never failed to spend time with them each and every weekend.

Well, that original didn't have a comma splice in it. Here's an example of a comma splice:

The elderly man was a grandfather to seven youngsters, he never failed to spend time with them each and every weekend.

And here's an example of a fused sentence:
The elderly man was a grandfather to seven youngsters he never failed to spend time with them each and every weekend.

The ways to correct given by Anonymous above are correct.

To fix the comma splice or fused sentence in the given sentence, you need to use appropriate punctuation and conjunctions to separate the clauses properly. Here's how you can do it:

"The elderly man was a grandfather to seven youngsters, and he never failed to spend time with them each and every weekend."

In this revised sentence, a comma is used before the coordinating conjunction "and" to separate the two independent clauses. This construction helps to clearly distinguish the ideas being conveyed.