Sorry for the delay!
Alright, so far from what I see, the most recent bill has all 3 lines still on it (probably due to the bill being established before the line was canceled. Not sure which one was canceled, but with this plan, it would be dropping off the $19.99 charge for that 3rd line and the $10 premium data add on in that has a smartphone. So that's $29.99 dropped off now. I noticed you had the $15 loyalty credit for your leased phone as well. That's an exclusive offer to your current plan that wouldn't be available on the newer plan and would be removed upon switching to the new plan. Overall, your new charges for the account that you would be looking at is $159.99 + taxes off this cost.
Break down of pricing $110 for the first line + the $10 premium data add on + $19.99 for the second line + $10 premium data add on + $25 for the lease - $15 for the loyalty credit = $159.99.
With the newer plans such as the 40GB Family Share Pack, it would be $120 for the data package and $15 for the access fee per line, it comes to $150 before taxes and the Lease cost, after that, you would actually be at $175 a month before taxes, so we're higher on this one due to that loyalty credit you currently receive on the current plan.
Breakdown of pricing $120 for 40GB data package + $15 access fee + 15 access fee+ $25 lease cost = $175.
The 10GB family share Pack option would be $20 less, coming to $100 for the data package and $15 for the access fees, coming to $130 a month before taxes and the lease cost bringing it all to an overall $155 a month cost before taxes.
Breakdown of pricing $100 for 10GB Data pack + $15 access fee + $15 access fee + $25 lease cost = $155.
Personal opinion, due to the loyalty credit you receive, I would recommend staying with the plan just so you can keep fully unlimited data and take advantage of the $15 loyalty credit. If you can also add an employer, AAA, or credit union discount, it'll help even bring it down further. AAA and credit unions are usually about 10% off, so that will be another ~$11 dollars off the bill.
To see about adding the discount you can visit here or by visiting here to see if you qualify.