NA, sweetheart, please dont consider it. Your 49 year old neighbour is being incredibly irresponsible suggesting it. AGE is nothing to do with this discusison, and totally digresses from the important subject of wether or not you should leave your 19 month old son, in a house, on his own for an evening while you work, baby monitor or not this is the reality of what you are suggesting.
You simply CANNOT leave a baby of that age ( or any ) alone in ahouse for that period of time. Its NOT on!
WOuld your neighbour put her hand up, and admit responsibility should something terrible happen, unexpectedly, and say to the police, "yes sir, I was in charge of him, throught the wall nad behind 2 closed doors" ? would any one? would you?
Come on NA, you are a bright, intelligant person, you love that little man, more than life itself, imagine how you would feel if SS knew of this and did something, or, if something happened, how owuld you feel for the rest of your life? really?
Our life is not full of certainties at all. We never, any of us know whats round the corner. All we have to rely on, is common sense, gut feeling, imagination instinct and learned knowledge. you have the benefit of many peoples common sense, instincts and imaginations here.. use it fully and properly, and don't take the risk. PLEASE ?