add/remove fields in django forms - django

Question

So I have a form where user can post "Parents" details also fields for Children from a different model.
What I need is that to allow users to add "Children" fields as many children as they have . Also for the children fields not to be required in case they do not have children.
But, if one of the children fields is filled the others are required.
models.py :
class Parent(models.Model):
title = models.CharField(max_length=250)
address = models.CharField(max_length=250)
class Kid(models.Model):
family = models.ForeignKey(Parent)
title = models.CharField(max_length=250)
age = models.CharField(max_length=250)
views.py
def add_family(request):
if request.method == 'POST':
parent_form = ParentForm(request.POST)
kid_form = KidForm(request.POST)
if parent_form.is_valid() and kid_form.is_valid():
parent = parent_form.save(commit=False)
parent.save()
kid = kid_form.save(commit=False)
kid.family = parent
kid.save()
return redirect('index')
else:
parent_form = ParentForm()
kid_form = KidForm()
template = 'add_family.html'
context = {'parent_form': parent_form, 'kid_form': kid_form}
return render(request, template, context)
template:
<form method="post">
{% csrf_token %}
{{ parent_form.title }}
{{ parent_form.address }}
{{ kid_form.title }}
{{ kid_form.age }}
<button type="submit">Send</button>
</form>
so if the "kid_form.title" is filled. then the age is required.
any help?