THIS IS NOT AGGRESSION, trust me -- she is not even 4 months old yet!
She is also very young and will STILL be going through mouthing and nipping for weeks yet.
Did you download Ian Dunbar's book that I've mentioned to you a couple of times? Have you had a chance to read it? Please, please, please do so; understanding her is so extremely important if you want a well behaved happy dog. These kinds of issues are dealt with there and you will get great advice using the book -- please do not misread this *normal* puppy behaviour as aggression as she is really only a small puppy still! She's the equivalent of a 4 year old. She has barely begun her training and socialising journey and training is more than learning a first handful of puppy commands, many of which she will not really remember in another two months or so (most young dogs learn a few things initially and promptly forget many of them around puberty in the same way kids 'forget' a lot of their good behaviour when they reach 13 or so...
).
Really, your family do need to be viewing this with a different mindset or you risk actually ending up with a dog with some problems. Yelling at a puppy for example -- she was being forcibly restrained, this was undoubtedly uncomfortable for her as she squirmed, she wasn't happy and she did what puppies do -- she growled and when no one paid attention to that, she snapped to be let down. From her point of view, yelling at her confirms to her that the whole situation was frightening and uncomfortable and that humans do totally scary and unpredictable things when they try to hold you down.
The way to address this is to start now, while she is still a baby, to train her so that she is happy and comfortable being handled in a variety of ways and being restrained for short periods. All of this is in the book I recommended. I'd really suggest reading it from cover to cover and to work every day on the exercises Dr Dunbar has there as this is a critical time to be training her to be a happy puppy with good self control. Teaching to sit etc is nice, and important, but isn't relevant at all to having a dog that is comfortable with being handled. That's where using this excellent book as a guide for her entire first year will help you greatly.
If you truly feel you are seeing aggression then I would recommend ringing Dog Training Ireland to make an appointment for an assessment the next time your family are up in Dublin.
I am sure they will reassure you though that these are all in basic training and socialising issues however, and very normal behaviour for a young puppy.
A puppy this young will NOT be showing aggression unless there are serious genetic problems causing it. I am very sure this is not the case.
Please never yell at a pup though -- this truly risks ending up with a timid dog afraid of people, and afraid of being handled -- the start of potentially serious problems.
PS Why is she getting drops in her ears all the time? Puppies do not find this comfortable at all, and vets tend to have a confidence in managing dogs that makes this look easy -- it is absolutely normal for her to be struggling to get away from this disliked task. Maybe ask your vet for advice on how to do drops net time you are in? It can be very painful if the nozzle goes in the wrong way, the drops are too cold, she is held in an uncomfortable way, etc. Most of us have a hard time getting drops in ears.