I've signed up for the Stirling Marathon too - my kids are 8 and 5, and I will be 50 next year (although I'm still in denial about that.....).
The bottom line is that you will never have enough time for marathon training unless you make the time - a bit like you will never be able to afford to have children.
My training plan is currently 5 miles on a Wednesday morning (my day off work and the kids are now both at school), parkrun on a Saturday and a long one on a Sunday morning - hubby takes the girls to rugby, and I run from the house to the training ground and meet them there.
This week I did 5 miles on Sunday, and I plan to increase it by taking a different route each week, so I will be leaving the house before they do as time goes on. I'll increase the Wednesday run up to a maximum of 10 over the winter, and will volunteer to do course clear up at parkrun (running round the route picking up flags and cones) to get a mile or two more in. In addition, if I can get out for a run at lunchtime from work (we have a shower), I can maybe get one or two extra 3-milers in a week, depending on how busy I am.
You do need to be more organised when you have kids (in all parts of your life) but it is doable. If you are half-marathon fit at the moment (I'm not, but I have been in the past), then you have a good base to work from. Keeping fit and having aspirational goals is not a "luxury" in my book - it sets a good example to your kids and is great stress relief - which is certainly useful with toddlers!
I've used Superfeet insoles for years due to a fallen arch which put me out of alignment. I have a pair in my running shoes and walking boots, and if I am going to be walking any distance, I swap a pair into my "day" shoes. They last for ages (I've been wearing them for about 15 years and am only on my 4th pair) so even at £25 they are pretty good value.
I haven't used the cheaper ones, so can't make a comparison.
I switched from motion control shoes to mild support shoes with my insoles, because although the MC stopped the roll, it didn't support the arch the way I needed it to. Depending on the root cause of her pain, that's maybe something to consider.
First time I can genuinely say I enjoyed watching a Samba - usually at best think "They made a good job of that" but Oti's choreography was amazing, and Danny really did it justice - a well deserved 40.
Claudia and AJ's AT was stunning, and I felt undermarked. First time this series I've rewound and watched a dance again.
Ore and Joanne's Paso was great - I did spot the wobble, but if he'd got it right it would have been a 40 contender too.
Louise and Kevin's waltz - I still can't quite connect with her, but it was really well danced and a good "story".
Judge Rinder and Oksana's rhumba - well, he enjoyed it, and it was always going to be tough because a romance wouldn't be believable. Pretty good job in the circumstances, and I'd have been unhappy if he'd gone before Ed.
Ed and Katya - yup, time's up. So long and thanks for all the fish.