i don’t know how/if i can add another tag?? flair?? but tw for substance abuse and alcoholism below also!!!

i posted here recently and it was very helpful and the support was pleasantly surprising (thank you again to everyone who read/replied and this sub as a whole!!) i just have a couple more questions/things to say/what have you. 

1. is it common for people with bpd to have mentally ill parents as well?? what about a bpd parent? is this part of what influences us to have/develop bpd or no?

2. my father has bipolar and my mom has bpd, both of these diagnoses i wasn’t fully aware of until rather recently. we unfortunately but unsurprisingly have similar ticks and triggers and etc. which makes it hard not to be impacted by them. does anyone have any tips for how to handle/help with their problems and/or outbursts without setting myself back or getting myself upset as well?

3. is substance abuse common for people with bpd?

4. i’ve had a lot of struggles with substance abuse and alcoholism and am 1 month and 2(??) weeks sober on alcohol. this is my second time going sober and i only made it 3/4 months without alcohol last time. i’m having a lot of trouble staying off the booze without turning to other vices (weed, cocaine, molly, acid...) to take the edge off. i just crave a beer or SOMETHING and even though i know it’s not good for me and i’m not a good person when intoxicated i can’t help the large part of me that is throwing a temper tantrum and whining about how it isn’t fair other people get to have fun and i don’t. i’ve also been told multiple times i’m better when i’m drinking and more fun to be around and generally feel like people like me more when i’m drinking. i’m good at it! i have a high tolerance and can outchug anyone and take straight shots and am known (like... KNOWN) for my drinking and antics and ability to drink people under the table and be a good time. it’s kind of always been my thing, i guess. 
tl/dr: does anyone have any tips for staying sober? without turning to other substances?

5. what is dbt? i’ve heard it mentioned a lot on this sub but googling dbt brings up a few different things.

6. what is splitting? this term has also come up a lot looking through the sub and while i kind of get it i am still confused. is it referring to when you dissociate and split from your?? normal state of being?? is it when you change your mind/view or someone or something? i know this is a silly question but it would be great to clarify.

and in advance: i know i get a little longwinded and word things funny so. thank you for reading snd bearing with me!