The voices were, at times, felt a bit forced in terms of delivery. There were moments where I couldn't quite believe the characters and almost felt like caricatures. None of them really seemed memorable and sound just like any other adult trying to do a old man, flamboyant boy, etc. However, they were decent for what they were and they did make your range more differentiated. A fair warning though. Having a vast vocal range does not necessarily mean success. Remember to keep in mind the voices that you can do with believability and skill are always your friends. Acting is the most crucial part of voice acting. It also is helpful to know what sort of character type your best voices in (cocky teen, mysterious stranger, villain, etc.) and learn to often stick with that typecasting in order to nail it. One might think that this may limit them artistically, but it does make wonders when you're good at one or a few particular types, especially when it comes to auditions. Just keep at it, believe in yourself, practice, and audition if you feel that you want to do this for more than just a mere hobby.
Now, the writing is a bit awkward. The gross-out scenes seem to be trying too hard to really hit one in the funny bone in its delivery, and the overall focus of the story,in my opinion, it doesn't seem to exemplify the theme entirely well. The main character may seem to be meeting his aunt and family for the first time, but to have it revealed that he was at the neighbor's house the whole time sorta kills it. If this was going for the theme, "Simple misunderstanding/mistake" or "In the life of another family", this entry might have done it justice. Though this is just my opinion on the matter.
Lastly, the sound effects did have a dull quality to them. Nothing really stood out, and often times there could have been a better example to fully exhibit its purpose. If you ever want to look for other sound effects, check out these websites: www.freesound.org, www.soundbible.com, and www.freesfx.co.uk are some examples that I use for sound effects.
Overall, this was definitely not a bad effort. There is some potential in this, and if you really like doing this, don't give up on it.