I wonder if this is a case of incorrect terminolgy.
The term 'epileptic fit' is commonly misappropriated for all types of seizure or convulsive-type activity. For example, in children aged between six months and six years, seizures due to fever are quite common.
A person is usually diagnosed as
having epilepsy if they have had two
or more seizures that started in the
brain. However, getting a diagnosis of
epilepsy can be difficult because
there is no single test that can
diagnose epilepsy.
[...]
Because there is no obvious sign a
person has epilepsy, unless they are
having a seizure, it can make
diagnosing epilepsy difficult. A
diagnosis is usually made after a
person has had more than one epileptic
seizure. When a person has had a
seizure they may not remember what
happened, so it can be helpful to have
information from someone who saw the
seizure happening.
[...]
Anyone can have a single epileptic
seizure at some point in their life.
This is why a diagnosis of epilepsy is
usually only considered when a person
has had more than one seizure.
However, if you have had only one
suspected seizure your doctor may
still want to investigate it, as there
can be various possible causes.1
Emphasis mine.
It's quite possible that your relative did have a seizure or some type of convulsive activity as a child. That doesn't necessarily mean he had/has epilepsy. That said, if he did indeed have epilepsy, remission is commonly seen:
Whether your child "outgrows" epilepsy
will be dependent upon several
factors. First, the diagnosis should
be clarified. Epilepsy is defined as
at least 2 seizures occurring more
than 24 hours apart without acute
provocation. Therefore, if your child
had one seizure or had only febrile
seizures, she does not have epilepsy.
Epilepsy can be described by seizure
type and also by syndrome. Prognosis,
or whether your child outgrows
epilepsy, will depend most on the
epilepsy syndrome. Seizure syndrome is
based on the age of onset of seizures,
electroencephalographic (EEG) pattern,
and seizure type.
Some epilepsy syndromes are "benign,"
meaning that the seizures will remit
within a certain age
range.2
Emphasis mine.
Conclusion: Either he had epilepsy and has outgrown it, or never had epilepsy.
1The National Society for Epilepsy: About epilepsy > Diagnosis > How epilepsy is diagnosed.
2The Epilepsy Foundation of Metropolitan New York: My child was diagnosed with epilepsy, will she outgrow it?