I truly, really 2nd the advice about the Triple P program. Start there. Its for your sanity as well. You will probably need to organize your hubby to go too, or at least take notes for him.
You need a 'wall' of parenting for little tykes like these, you can't do this on your own. You need a 'plan'!
Also, re child proof your house. Get EVERYTHING out of the way, screwdrivers, shampoo, basically anything that can be squirted, squashed or used as a weapon....
Here, lots of things live on top of the fridge, talcum powder lives on the bookcase, shampoos bubble bath on top of the shower recess, and toys that have turned into weapons on top of a high unit.
If you can, and I
highly recommend this one get out and about
with Jaz on your own, even if it is just to run errands. Give her an agenda ie - bakery, bank then to visit Aunty Margo. I often feel my
DS wants alllll the attention allllllll of the time, and negative attention is just as good as positive to him

. However on the occasion when I can, I leave
DD at home with her dad, take
DS with me and he is my perfect little helper.
DO let your mum take her, even if overnight and a day. Nannas have more time and a different routine. My liddle monster quite happily has lunch at the Yacht Club and is perfectly well behaved with his nan. Well he has moments but nan has more patience and less babies around!
We get a break, he feels grown up - and does get allllll the attention when he is there. Jaz will also get a break from her own cr@ppy behaviour routines too. This can only be a positive thing for all of you. Don't look at it from a negative view - we ALL need a village to help us raise our kids, this does not mean failure as a parent.
DS is also bluddy awful to his sister too. Sometimes it feels like he should have been an only child........
In any case I am getting some help on a one on one basis to help me help
DS with his behaviour. Don't feel alone - there are many avenues you can take before you have to consider medication.
xoxoxoxoxo