there a couple of mums who keep asking me to look after their children. it isn't a social thing as my ds1 is at school when they make most of the requests - its childcare they are after without the payment. i have a baby and work from home so i feel a little used and don't want them to expect me to do this in the future. my ds gets on really well with one of them so i don't want to undermine any new friendships for his sake (he is 3). both mums are acquaintences rather than friends so this is probably why i am finding it more chore than pleasure. am i being unreasonable? if not, how do you say no and mean it - in a nice way?